linux-kernel - Re: [Kgdb-bugreport] 2.6.23-rc3-mm1: kgdb build failure on powerpc

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Date:	Wed, 29 Aug 2007 21:13:10 -0500
From:	Jason Wessel <jason.wessel@...driver.com>
To:	pete@...elane.com
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	kgdb-bugreport@...ts.sourceforge.net, amitkale@...syssoft.com,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Mariusz Kozlowski <m.kozlowski@...land.pl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [Kgdb-bugreport] 2.6.23-rc3-mm1: kgdb build failure on powerpc

Pete/Piet Delaney wrote:
> We are getting a problem with VMware where kernel text is the schedler
> is getting wacked with four null bytes into the code. Thought I'd use
> the current linux-2.6-kgdb.git tree and possible the CONFIG_DEBUG_RODATA
> patch to make kernel text readonly:
>
>  https://www.x86-64.org/pipermail/patches/2007-March/003666.html
>
> I thought the kernel text was RO and gdb had to disable it to
> insert a breakpoint.
>
>   

If you are going to make all the kernel text RO, then you are going to 
have to add some code to the kgdb write memory so as to unprotect a 
given page or all the breakpoint writes are going to fail.  
Alternatively you can use HW breakpoints.  But, I have no idea if your 
VM Ware simulated HW emulate HW breakpoint registers or not.

Jason.
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